Well the whole question is in the title. Say I have the following launcher
#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Type=Application
Terminal=false
Name=Lantern
Comment=Lantern interface to ICC
Exec=/usr/bin/java -jar /home/john/local/lantern-chess/lantern.jar
Icon=/
how do I make it run in the /home/john/local/lantern-chess/
folder?